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	<!-- kbd keyboard -->
	<p><kbd>ctrl+v</kbd>是粘贴的快捷方式</p>
	<p><var>x <sup>2</sup>+y <sup>2</sup>=36</var></p>
	<!-- <p><var>x</var><sup>2</sup>+<var>y</var><sup>2</sup>=36</p>      写法二 -->
	<code>&lt;br&gt;</code> &yen;
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